Tom Cohen wrote:
Dear list,
How can I calculate the difference in days between the eventdate and basedate in the below dataset?
id basedate outcome.3 eventdate daydiff
1 1001 1999-09-28 2 1999-10-01 3
2 1002 1999-09-22 1
3 1003 2000-01-19 1
4 1004 2004-01-25 2 2004-02-03 9
5 1005 2005-08-11 1
6 1006 2000-07-04 1 2001-05-29
7 1007 2004-02-12 1 2004-11-18
8 1008 2006-01-18 2 2006-02-02
9 1009 2005-04-29 2 2005-06-14
10 1010 2006-03-17 2 2006-03-31
11 1011 2000-03-21 2 2000-03-28
12 1012 2004-07-12 1 2006-11-28
13 1013 2000-02-24 1
14 1014 2003-04-17 1
15 1015 2000-04-05 1
Given they are in some appropriate time format (e.g. when reading
specify colClasses = "POSIXct" for those columns or use strptime() on
the colummns later on):
difftime(x$eventdate, x$basedate, "days")
Uwe Ligges
Thanks for any help,
Tom
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